Enable ip geolocation on cloudflare worker on workers.dev domain ?

Is it possible to add the ip geolocation on a cloudflare worker which is served from *.workers.dev ?
If so how to do because the documentation don't mention it.
https://developers.cloudflare.com/network/ip-geolocation/

Cloudflare Docs

IP geolocation adds the CF-IPCountry header to all requests to your origin server.